87 lines
3.7 KiB
Go
87 lines
3.7 KiB
Go
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// 被测契约：上缘、标准气象下的 0° 穿越与现有日出日落一致；高纬状态与相切判定正确。
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package basic
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import (
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"math"
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"testing"
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"time"
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)
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func beijingDate(y int, m time.Month, d int) time.Time {
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return time.Date(y, m, d, 0, 0, 0, 0, time.FixedZone("CST", 8*3600))
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}
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func TestSkyAltitudeCrossingMatchesSunriseAtHorizon(t *testing.T) {
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jd := Date2JD(beijingDate(2025, 3, 20))
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rise, err := GetSunRiseTimeWithAtmosphere(jd, 116.4, 39.9, 8, 0, 1010, 10, nil)
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if err != nil {
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t.Fatal(err)
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}
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set, _ := GetSunSetTimeWithAtmosphere(jd, 116.4, 39.9, 8, 0, 1010, 10, nil)
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got, err := SkyAltitudeCrossingWithInstance(SkySun, jd, 116.4, 39.9, 8, 0, 0, AltitudeCrossingOptions{}, nil)
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if err != nil || got.State != AltitudeCrosses {
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t.Fatalf("state %v err %v", got.State, err)
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}
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if d := math.Abs(got.Rise-rise) * 86400; d > 2 {
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t.Errorf("rise differs by %.2f s", d)
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}
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if d := math.Abs(got.Set-set) * 86400; d > 2 {
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t.Errorf("set differs by %.2f s", d)
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}
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civil, _ := SkyAltitudeCrossingWithInstance(SkySun, jd, 116.4, 39.9, 8, 0, -6, AltitudeCrossingOptions{Limb: AltitudeLimbCenter, NoRefraction: true}, nil)
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if !(civil.Rise < got.Rise && civil.Set > got.Set) {
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t.Error("civil twilight must bracket sunrise and sunset")
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}
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}
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func TestSkyAltitudeCrossingStates(t *testing.T) {
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summer := Date2JD(beijingDate(2025, 6, 21))
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winter := Date2JD(beijingDate(2025, 12, 21))
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above, _ := SkyAltitudeCrossingWithInstance(SkySun, summer, 20, 78, 0, 0, 0, AltitudeCrossingOptions{}, nil)
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below, _ := SkyAltitudeCrossingWithInstance(SkySun, winter, 20, 78, 0, 0, 0, AltitudeCrossingOptions{}, nil)
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if above.State != AltitudeAlwaysAbove || below.State != AltitudeAlwaysBelow {
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t.Errorf("polar states %v %v", above.State, below.State)
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}
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peak := 90 - 39.9 + 23.4366
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tangent, _ := SkyAltitudeCrossingWithInstance(SkySun, summer, 116.4, 39.9, 8, 0, peak, AltitudeCrossingOptions{Limb: AltitudeLimbCenter, NoRefraction: true}, nil)
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if tangent.State == AltitudeCrosses && !math.IsNaN(tangent.Rise) && !math.IsNaN(tangent.Set) && (tangent.Set-tangent.Rise)*1440 > 30 {
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t.Errorf("near-peak altitude should graze, got %+v", tangent)
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}
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if _, err := SkyAltitudeCrossingWithInstance(SkySun, summer, 0, 95, 0, 0, 0, AltitudeCrossingOptions{}, nil); err == nil {
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t.Error("invalid latitude must fail")
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}
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}
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func TestStarAndPlanetAltitudeCrossing(t *testing.T) {
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jd := Date2JD(beijingDate(2025, 3, 20))
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star, err := StarAltitudeCrossing(jd, 101.287, -16.716, 116.4, 39.9, 8, 10, AltitudeCrossingOptions{})
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if err != nil || star.State != AltitudeCrosses || math.IsNaN(star.Rise) || math.IsNaN(star.Set) {
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t.Fatalf("Sirius at 10°: %+v %v", star, err)
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}
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mars, err := SkyAltitudeCrossingWithInstance(SkyMars, jd, 116.4, 39.9, 8, 0, 0, AltitudeCrossingOptions{}, nil)
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if err != nil || mars.State != AltitudeCrosses {
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t.Fatalf("mars: %+v %v", mars, err)
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}
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}
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func TestAltitudeCrossingFindsNearPeakCrossings(t *testing.T) {
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jd := Date2JD(beijingDate(2025, 3, 20))
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options := AltitudeCrossingOptions{NoRefraction: true}
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for ra := 0.0; ra < 360; ra += 15 {
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got, err := StarAltitudeCrossing(jd, ra, 19.9, 116.4, 39.9, 8, 69.999, options)
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if err != nil || got.State != AltitudeCrosses || got.MaxResidual <= 0 {
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t.Fatalf("ra %v: %+v %v", ra, got, err)
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}
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if !math.IsNaN(got.Rise) && !math.IsNaN(got.Set) && !(got.Rise < got.Set && (got.Set-got.Rise)*1440 < 10) {
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t.Errorf("ra %v: rise %v set %v", ra, got.Rise, got.Set)
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}
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if math.IsNaN(got.Rise) && math.IsNaN(got.Set) {
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t.Errorf("ra %v: no crossing", ra)
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}
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}
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missed, _ := StarAltitudeCrossing(jd, 90, 19.9, 116.4, 39.9, 8, 70.01, options)
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if missed.State != AltitudeAlwaysBelow {
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t.Errorf("above peak: %+v", missed)
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}
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}
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